Riot Game(s)
You call yourselves Riot Games, but you have only made one game (I do not include "Cho'Gath Eat World").
You have a lacking Lore in your current game.
Heres an idea.
"Valoran": an mmorpg set in runeterra, from the perspective of a summoner. Hell, you have the fan base, you have the funds. Bonus points for a VR option.
(maybe unrealistic, but hey. I can dream, Harold.)